47results about How to "Has a decolorizing effect" patented technology

The invention discloses an excess sludge treatment method which comprises the following steps: adding excess sludge to a reaction tank, with high speed stirring at 15-50 DEG C, adding a surfactant and sodium percarbonate to the reaction tank, after 0.5-5h of reaction, adding nano zero-valent iron, at 15-50 DEG C reacting for 1-8h, sending the sludge into a magnetic separator to remove the nano zero-valent iron containing heavy metals in the sludge; performing mechanical dewatering of the treated sludge to respectively obtain purified sludge and water. The excess sludge treated by the method is low in water content and high in heavy metal removal rate, the treated water is low in (chemical oxygen demand) COD value, and the excess sludge treatment method is low in cost, green, and free of secondary pollution, and can lay a foundation for agricultural or forestry sludge or other resource method.

A process for treating the sewage generated in extracting saponin from yam by hydrochloric acid method includes such steps as draining said sewage in quality and flow regulating pool, pumping it in pH regulating, reacting and depositing pool, flowing in aerating and electrolyzing reactor for pre-treating, flowing in another pH regulating, reacting and depositing pool, heating to 35-40 deg.C, anaerobic treating, inoculating Cl-resistant microbes, aerobic treating, inoculating Cl-resistant microbes, coagulating, depositing, oxidizing by ozone and adsorbing by activated carbon.

The invention relates to a membrane module with filler inside, belonging to the technical field of water purification. The invention relates to a membrane module with filling inside. The membrane element is arranged inside the membrane module, and a filling space is arranged inside the membrane module. The filling space is filled with granular filler. The membrane module effectively reduces the pollution load of the membrane itself, and has the effect of cleaning the pollution on the surface of the membrane during filtration.

The invention discloses a nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as a preparation method and application thereof. The main preparation method comprises the following steps of: (1) pretreating a PVDF microfiltration membrane; (2) functioning the PVDF filter membrane by taking acrylic acid (AA) as a functional monomer; (3) respectively immersing the functioned PVDF filter membrane into sodium salt and soluble iron salt solutions for ion exchange, loading iron ions on the functioned PVDF filter membrane; and (4) immersing the PVDF filter membrane into a borohydride salt solution so as to prepare the nano-loading zero-valent-iron-based PVDF compound material under the strong reduction action. By respectively repairing simulative dyeing wastewater, heavy metal wastewater and anionic organic wastewater at the room temperature through using the reduction function of the material, the nano-loading zero-valent-iron-based PVDF compound material as well as the preparation method and the application thereof disclosed by the invention are conveniently and simply operated and easily recycled, have the advantages of low cost and good dispersity of nano iron particles, and are capable of reducing ecological risks caused by that the nano iron particles flow into water so as to improve the service cycle of the compound material. The nano-loading zero-valent-iron-based PVDF compound material can be regarded as an environment-friendly environment restoration material.

The invention belongs to the field of papermaking and discloses a method for preparing recycled newsprint from old newsprint. A modified filler material is further prepared by taking calcium carbonateas a raw material, taking chitosan, octadecanoic acid and sodium hydroxide as coating agents and taking calcium chloride as a cross-linking agent. The surface of calcium carbonate can be well coatedwith a cross-linking agent of cationic chitosan and softened to completely combine with fibers, and accordingly binding force between modified calcium carbonate and the fibers can be enhanced, the retention rate of filler calcium carbonate is increased, newsprint production cost can be reduced, and environment pollution load can be reduced. Problems of poor newsprint quality and environment pollution caused by all existing recycled newsprint processes are solved.